mineral

Druzy Quartz

Crystalline Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Typically white, clear, or gray; Luster: Vitreous to sparkling; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Typically white, clear, or gray
Luster: Vitreous to sparkling

Identified June 17, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 (Mohs scale); Color: Typically white, clear, or gray; Luster: Vitreous to sparkling; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Formation & geological history

Formed when water brings silica into a rock's cavity, which then cools and minerals precipitate out to form tiny crystals on the surface. Usually found in geodes or vugs within igneous or sedimentary rocks.

Uses & applications

Primarily used in jewelry (pendants, rings, earrings) and as decorative collector specimens due to its high sparkle and aesthetic appeal.

Geological facts

The term 'druzy' (or drusy) refers to the coating of fine crystals on a rock surface. Titatinum-coated druzy is a popular modern variation where the crystals are given a metallic, iridescent sheen through vapor deposition.

Field identification & locations

Identify by its 'sugar-like' appearance and intense sparkle under light. Commonly found in Brazil, Uruguay, and various parts of the USA. Collectors look for uniform crystal coverage and lack of inclusions.